function setupDropTargets() {
	var centerContainer = Ext.getCmp("cmp_MyCenterPanel");// 指定拖拽的目标位置
	var centerContainerDropTargetEl = centerContainer.body.dom;
	var centerContainerDropTarget = new Ext.dd.DropTarget(
			centerContainerDropTargetEl, {
				ddGroup : 'DDGroup',
				notifyEnter : function(ddSource, e, data) {
					centerContainer.body.stopFx();
					centerContainer.body.highlight();
				},
				notifyDrop : function(ddSource, e, data) {
					var node = ddSource.dragData.node;
//					if (!node.attributes.allowDrag)
//						return false; // 不允许porlet添加节点
					var channel = getChannelFromNode(node)
					portalPanel.addDefaultPorlet(channel);
					return (true);
				}
			});
}